Data consistency models

Data consistency models define how systems keep data uniform across multiple servers or locations. Think of it as a set of rules ensuring that everyone sees the same information, even when updates happen simultaneously. Some models, like strong consistency, guarantee everyone gets the latest data immediately. Others, like eventual consistency, allow temporary differences but ensure everything syncs up eventually. These choices balance speed and reliability, depending on the needs of the application—whether it's critical to have the most up-to-date info instantly or acceptable to see slightly outdated data for faster performance.